Delete specific rows in a multidimensional matrix

Question

David Ponce 2018-10-23

0
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https://ww2.mathworks.cn/matlabcentral/answers/425724-delete-specific-rows-in-a-multidimensional-matrix

编辑： James Tursa 2018-10-24

Hello, I have a problem with deleting rows in my multidimensional matrix. The thing is that I have a matrix A 800X1X100 with angles and i have to delete the rows that meet the condition. Here is my code:

for k=1:1:100
    if(or(Z(k,1,:)>=230,Z(k,1,:)<=330))
        Z(k,1,:) = [];
    end      
end

here is the error: A null assignment can have only one non-colon index.

Thank you.

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David Ponce 2018-10-23

same error, but thanks for the answer.

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Answer 1

gonzalo Mier 2018-10-24

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The solution for your problem could be:

Z=rand(800,1,100)*400;
for(k=800:-1:1)
    if(or(Z(k,1,:)>=230,Z(k,1,:)<=330)) 
        Z((k-1)*100+(1:100)) = []; 
        Z = reshape(Z,[],1,100)
    end
end

or use the squeeze function to make Z shape [800,100]

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David Ponce 2018-10-24

编辑：David Ponce 2018-10-24

在 MATLAB Online 中打开

Thanks for the answer, but now I know the problem, the thing is that I have to reshape my multidimensional matrix as I go deleting the rows. I have this:

    for m=1:1:size(Z,3)
    for n=1:1:size(Z,1)
        if(and(Z(n,1,m)>=230 , Z(n,1,m)<=330)) 
            Z(n,1,m) = [];  %here is the problem i have to reshape
        end
    end
end